ScienceDaily (Apr. 18, 2006) — At a news conference today in the western Patagonian city where the news species was found, paleontologists will unveil what may be one of the largest carnivorous dinosaurs known. Mapusaurus roseae, is named and identified in Geodiversitas by Professor Rodolfo Coria of the Museo Carmen Funes in Plaza Huincul, Argentina and Dr. Philip Currie of the University of Alberta, Canada.

"Over the last decade, people have become increasingly aware of a group of gigantic meat-eating dinosaurs called carcharodontosaurids," explains Currie. "These animals include Giganotosaurus, which was larger than the largest known specimen of Tyrannosaurus rex. After four years of working in a dinosaur quarry in Argentina, we discovered that we had a new species of carcharodontosaurid that we called Mapusaurus roseae."

Hundreds of Mapusaurus bones were found in sandstone 100 million years old. The remains include what may be one of the biggest meat-eating dinosaurs known, slightly larger than its older cousin, Giganotosaurus. The discovery, made 15 miles south of the city of Plaza Huincul in 1995, took five years of excavation under the direction of Coria and Currie who removed 100 tons of sandstone from a desert hilltop.

ScienceDaily (Jan. 13, 2011) — A team of paleontologists and geologists from Argentina and the United States on Jan. 13 announced the discovery of a lanky dinosaur that roamed South America in search of prey as the age of dinosaurs began, approximately 230 million years ago.

Sporting a long neck and tail and weighing only 10 to 15 pounds, the new dinosaur has been named Eodromaeus, the "dawn runner."

"It really is the earliest look we have at the long line of meat eaters that would ultimately culminate in Tyrannosaurus rex near the end of the dinosaur era," said Paul Sereno, University of Chicago paleontologist and National Geographic Explorer-in-Residence. "Who could foretell what evolution had in store for the descendants of this pint-sized, fleet-footed predator?"